I like Apollinaire a lot, John, and agree that his picture-poems are stand-out. An Italian poet I translated, Giuseppe Ungaretti, was a close friend of his. There's a prose piece of U.'s that describes receiving the news of Apollinaire's death and attending his funeral. U. was fortunate to survive WWI, and also wrote his first book in the trenches--in his case in the
Carso in northern Italy. It was a good time to be in Paris, but also very dangerous (Spanish flu as well, after the war, which Modigliani, another friend of A. and U., died of).
Sorry if I've gone off-topic--Ungaretti did not do visual poetry, that I recall. But there were so many great painters in Paris at that time, no wonder visual poetry was a thing.